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[rbdr/canvas] / src / lib / components / sensor.svelte

diff --git a/src/lib/components/sensor.svelte b/src/lib/components/sensor.svelte
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..94587058024a4f1b728c42aedd70d2afdd0b158a 100644 (file)
--- a/src/lib/components/sensor.svelte
+++ b/src/lib/components/sensor.svelte
@@ -0,0 +1,33 @@
+<script>
+       import { browser } from '$app/environment';
+       import { maxSize } from '$lib/config';
+       import { modulo } from '$lib/math';
+       import { canvas } from '$lib/stores/canvas';
+       import { sensor } from '$lib/stores/widgets';
+
+       const kSensorSize = 2;
+
+       let left;
+       let right;
+       let top;
+       let bottom;
+
+       let timer;
+       const fetchItems = function fetchItems(left, top, right, bottom) {
+               clearTimeout(timer);
+               timer = setTimeout(() => {
+                       sensor.set({ left, top, right, bottom });
+               }, 50);
+       };
+
+       $: {
+               if (browser) {
+                       left = modulo($canvas.x - window.screen.width * kSensorSize, maxSize);
+                       top = modulo($canvas.y - window.screen.height * kSensorSize, maxSize);
+                       right = left + 2 * window.screen.width * kSensorSize;
+                       bottom = top + 2 * window.screen.height * kSensorSize;
+
+                       fetchItems(left, top, right, bottom);
+               }
+       }
+</script>